Focusing-socket.



G. G. KNAUFF. FOCUSING SOCKET. APPLICATION FILED AUG. 11, 1914.

Patented Feb. 2, 1915.

7. HNAUFE, fill" CI'IHL- G0, ILLINOIS.

nonsense-sooner.

Specification of Letters Patent.

"Patented Feb. 2, EH5.

s m to which i uppertains to make and use the shire.

reflectors and more oerticulsrly to means e r flector so as to luring the lump filato moons insuring a. good electrical connection between certain relatively mot able pin (S of the reflector and socket combiion.

'Zore specific o s' ects of any invention ere to provide a simple d easily manipulated construction which w'll readily enable the portion of the i I he mo ed with respect provide iii l ir-euns for increasing the resistunce'of toe relutiv'e ourts to such a motion, so as to prevent their being accidentslly jarred out their normal position, while still permitting; of an intentional shiftg from said p sition; provide simple positive means for locking the rela ti; 1y movable in any given position; to "provide simple means for importing a S3 d licately graduated motion to the lamp with respect to the reflector; and to provide 'sositive means for insuring ii iii. connection between certain movable ports through ried to the lamp.

l my invention may ostnntiully equal toercnt ways, such as mpzinying drawings,

3 is an enlarged s ttzough the screw sup- ;ind s-zccuring clump member of e is a perspective view nientiher. Figs. 5 and. 6

us of other embodi- 7 is a perspecniemher of Fig. 6.

* invention relates to lump sockets and our-sly adjusting the lamp with respect properly nto the focus of the reflector,

Fig. 8 is an enlarged fragmentary transverse section through Fig. 6 along the line 8-8.

In each of the three embodiments shown in the accompanying drawings. the lamp 1 is housed by ft reflector 2 equipped with an opening through which the base of the lamp projects. Secured to the said reflector by any suitable means,such as u flange 3 overlapping the portion oi? the reflector adjacent. to said opening is a cylindrical shell 4 equipped on one side with a slot disposed either diagonally with respect to the periphery of the casing (as shown at 5 in Figs. 1 and or longitudinally of the casing as shown at 6 in 6. Slidably mounted within the said shell 4: is the metal casing 7 of main member of the socket, which main member is equipped with means for coupling the lump 1 to the forward end thereof and also equip tied {it its rear end with a terminal 8 for e wire 9 forming one terminus of u, circuit, the other terminal 10 of w iich circuit is grounded to the reflector 2. Mounted upon the main member of the 0 socket and projecting through the said slot in the shell is stenfwhich in the embodi' ment of Figs. 2 and (3 consists of the shank of a screw 22 threaded into the said main member presenting a head disposed outwzirdly of the shell Carried by the said screw and hearing at both ends against the surface of the shell 4: is a clamp member consisting of en. arched spring 11, which clamp member is equipped with a perforation through which the said stein of the screw extends and which may be flexed to alter its curvature by loosening or tightening the screw 22. The slot 5 is preferably disposed diagonally oi the casing as shown in Fig. 1,

.so that if the main member of the socket is rotated with respect to the shell (which may readily be done by manually grasping the bulb of the lamp 3. from the forward end of the reflector and rotating the some in either direction) the sides ot the said slot will present cam surfaces engaging the stem of the screw so to cooperate with the said rotation of the main member relatively to the shell l to cause the main member and the lamp carried thereby to be moved longitudinally oi the shell i, that is to say along the axis of the reflector.

The screw 22 is normally screwed up to the point where it clam member 11 :i suiiicient tension to cause the letter to engage the surface of the will give the resilient w focus.

shell 4 with a pressure which will prevent the said main member from jarring out of its normal position, but which will still permit the above mentioned adjustment when the main member is manipulated with suflicient force to overcome the said pres sure. It will be obvious that 'by loosening or tightening the screw 22 this. pressure may be varied as desired, thereby also permitting an adjustment which will compensate for variations in the resiliency of the clamp member, such as those caused by a gradual weakening of the said resiliency when the socket is in service. To avoid a loosening of the screw when the socket is in use, I preferably provide the said perforation in the clamp member with a plurality of ears 12 adapted to receive projections 18 on the under side of the head of the screw, the said projections being rounded so that they will ride out of the said recesses or ears when a sufficient pressure is applied to the screw to rotate the latter in either direction. However, the spring a n n I means for maintaining the clamp member m-engagement with the shell 4- need not be supplied by the clamp member itself. Thus,

7 provide the said parts with cooperating formations adapted to interlock so to afford a positive engaeement. Thus, in Fig. 1 I have shownthcl "casing l as equipped with corrugations 18 adapted to interlock with teeth 19 upon the respective ends of the clamp member. the shell 4 with corrugations 20 disposed circumferentially upon the shell 4 and interlocking with teeth 21 upon the clamp member as shown in Fig. 7.

When the socket of my invention is used with a circuit grounded to the reflector and hence likewise grounded to the shell 4:, and with a lamp having one terminal connected to the metal cas ng 7 of the main member of the socket, the pressure of the above described spring means will draw the said shell 1 and easing 5 firmly into enfiagement with each other along one side thereof, thus lDSUIiIlQ a'good electrical connection, which connection will be kept clean by the relative movement of the said parts when the lamp is being adjusted as to its Moreover, by using a diagonal slot as in Fig. l; I enable the user to effect a So also, in Fig-f6 l equip more delicate adjustment of the position of the lamp with respect to the reflector, since the .diameter of the bulb of the lamp will always be considerably greater than that of the shell 4, so that the extent of adjustment will be much less than that of the digital rotation of the bulb of the lamp. However, I do not wish to be limited to this or other details of the construction as herein disclosed, since it will be evident that the same might be modified in many ways without departing from the spirit of my invention.

I claim as my invention:

1. A focusing socket including in combination with a lamp, a main member car-- rying said lamp and having a substantially cylindrical outer surface, a substantially cylindrical casing housing a portion of said main member and equipped with aslot, a stem carried by the main member and projecting through the said slot in the casing, a clamp member carried by the said stem and disposed upon the surface of the casing, and spring means associated with said stem and clamp member for continuously press ing the latter against the casing.

2. A focusing socket including in combination with a lamp, a main member carrying said lamp and having a substantially cvlindrical outer surface, a substantially cylindrical casing housing a portion of said main member and equipped with a slot. a stem carried by the main member and projecting through the said slot in the casing, a clamp member carried by the said stem and disposed upon the surface of the casing.

manually adjustable spring means associated with said stem and clamp member and pressing the latter against the casing, and locking means associated with saidstein and spring means forrlocking the latter in positions within its range ofadjustment.

3. A focusing socket for a lamp, including a main member carrying said lamp and equipped with a metal shell connected to one terminal of the lamp, :1 metal casing housing a portion of said shell and slidable with respect thereto and connected to one terminal of a circuit, said shell equipped with a slot; a stem carried by the main member and projecting through the said slot in the casing, a clamp'member carried by said stem and engaging the surface of the casing, and means associated with said clamp member and said stem for pressing the latter against the casing to simultaneously lock the said casing and main member against relative motion and press the said casing and shell into firm contacting relation with each other.

4. A focusing socket for a lamp, including a main member carrying said lamp and equipped -with a metal shell connected to one terminal of the lamp, a metal casing housing a portion of said shell and slidable with respect thereto and connected to one terminal of a circuit, said shell equipped with a slot; a stem carried by the main member and projecting through the said slot in the casing, a clamp member carried by said stem and engaging the surface of the casing, spring means associated with said stem and clamp member and clamping a portion of the casing between said clamp member and a portion of the body member, and means for adjusting the tension of the said spring; the said spring when under light tension permitting of relative motion of the said casing and body member, and when under more severe tension locking the \said body member against motion with re aspect to said casing.

5. A focusing socket including in combination with a lamp, a main member carrying said lamp and having a substantially cylindrical outer surface, a substantially cylindrical casing housing a portion of said main member and equipped with a slot, a stem carried by the main member and projecting through the said slot in the casing, a clamp member carried by the said stem and disposed upon the surface of the casing, and spring means associated with said stem and clamp member for continuously pressing the latter against the casing, said slot being disposed spirally upon the casing, the sides of said'slot" presenting cam surfaces coacting with the said stem to move the main member longitudinally of the casing upon a rotary movement of said body memher with respect to the casing.

6. A focusing socket including in combination with a lamp, a main member carrying said lamp and having a substantially cylindrical outer surface, a substantially cylindrical casing housing a portion of said main member and equipped with a slot, a stem carried by the main member and projecting through the said slot in the casing, a clamp member carried by the said stem and disposed upon the surface of the casing, and spring means associated with said stem and clamp member for continuously pressing the latter against the casing, the said clamp member and the portions of the easing engaged thereby being equipped with relatively interlocking formations for preventing a relative motion thereof.

7. A focusing socket including in combinati on with a lamp, a main member carrying said lamp and having a substantially cylindrical outer surface, a substantially cylindrical casing housing a portion of said main member and equipped with a slot, a screw carried by the main member and projecting through said slot in the casing; a resilient clamp carried by said screw and engaging the surface of the casing and the head of the screw, and means associated with said clamp and screw for interlocking the same to prevent rotation of the screw with respect to the clamp and main member. In testimony whereof I have signed my name in presence of two subscribing wit- GEORGE C. KNAUFF. 

